Ripper head



A. H. WAGNER RIPPER HEAD Filed April 13, 1927 Efira/engr# ATTORN EY Nov.29, 1927.

Patented Nov. 29, 1927.

- UNITED STATES Y y* 1,651,305 PAT OFFICE? VJarliiiilur H..- WAGNER,oriaoNniin, ivroiv'iiiixui.Y y

j RIPPER HEAD.

Application filed April 13, '1927. vSerial 170.183,522.

)My present invention has reference .to a lumber ripping device, and theobject ofthe invention is the' provision of a cutter head which may bereadily'arranged upon a saw shaft or arbor and which includes a pair ofdiscs having their confronting faces formed with pockets for thereception of the ends of radially extending knives and wherein the saidknives are set at a slight angle with respect to the central linetherebetween to provide a clearance so thatthe knives will not becomeoverheated in the cutting operation, and further wherein theconstruction of knives is such as to afford smooth edges to the lumberoperated thereon. `f

'A further object is the provision of a cutter head for this purposethat is of an extremely simple construction, cheaply manufactured andarranged in operi ative position, and wherein the cutter head isprovided with pockets Vdisposed at opposite angles for the reception-,ofcutting knives which radiate from the head whereby' a space or clearanceis vmaintainedbetween the knives, so that the alternately arranged'knives will act upon the opposite edges of the kerf made thereby andwillnot Contact with thewood operated on with suiiicient friction tocause the overheating Vof the knives, so that the life of the cutterhead is thus materially prolongcdand further wherein the knives arestraight throughout the length thereofand may be removed or replaced forsharpening or renewal.

To the attainment of the above broadly stated objects and otherswhich'will present themselves as thek nature lof the invention is betterunderstood, the improvement also resides in certain other novel'features of construction, combination and operative association ofparts, a satisfactory embodiment of which is disclosed by theaccompanying drawings.

In the drawings:

In carrying out my invention I preferably employ a bushing 1 that hasone end flanged outwardly and `that is provided with one or morelongitudinal grooves2. These'grooves allow a sleeve, hereinafterreferred to to may be Figure 1 is a face view offa cutter head Figure 4isa detail sectional view ap-' contact with thebushing when a num-thatthreadedly; engages: the Ibushing is;- adjusted thereon. The lbushingisclamped on avsaw shaft or mandrel inthe vusual manner. `Fix.- edlyarranged on the bushing and contacting with the fiange on the outer endthereof there is a sleeve 3 which also has an outerflange 4. Screwedon'the bushing 1 and con# y tacting with the. sleeve 3 there is a nut 5.

. Arranged on the `sleeve 3 for turning therewith there is a pair ofdiscs 6 and 7 respectively. Each of these discs is of soft metal, andeach of these discs hasits confronting face milled to provide pockets 8for the cutting knives. 'Ihe alternating pockets 8 are disposed atopposite angles so that the ends of the pockets nearest the center ofthe head are disposed away from the op-A posite sides of the pockets adistance ofapproximately 15 of an inch. In each of these pockets thereis the inner straight end of cutter blades 9. Of course, the blades areof the same'length.- Each blade has one of its corners rounded to formthe same with a cutting edge 10 and the outer ends of the cutterbladesare cut atthe same angle, as indicated by the numeral 11. rIhereis screwed 4. The nut 14 is formed on its upper face with a iiange 15provided with wrench surf faces which is truewith respect to the nut 5.

The outer soft metal disc 7 ha-s radial kerfs orslots 16 in a line withthe center of the pockets formed in the said discs, and

between these kerfs there are threaded..

headed. screws 17 that connect the discs. Obviously the kerfs weaken theouter face of the disc 7 so that when the heads of the bolts are screwedthereagainst the inner face` of the disc will be compressed or in otherwords brought into tight contact with the inner face of the discs 6 sothat thefknives Varepositively pocketed between-the discs.

head the alternating knives will engage with the opposite walls providedby the kerf or cut and the clearance spaces between the knives preventthe overheating of such knives so that the knives will not burn and thelife thereof is materially prolonged. The cutting blades or knives arestraight throughout the length thereof and the outer angle ends willprevent marking or scratching ol the ede of the lumber.

Having described the invention, I claim A rotary lumber ripper,including two discs of :loft metal, each of said discs having theirinner faces at equidistantly spaced intervals provided with radiallydisposed pockets, and the alternating pockets heilig arranged at slightopposite angles with respect to each other, a straight cutter bladereceived in each pocket and radiating from the discs, one of said discshaving its outer face provided with radial kerfs disposed in a line withthe centralmeinbers and headed bolt members having their Shanks passingthrough the discs andarranged between the kerfs.

In testimony whereof I alx my signature.

ALBERT H. WAGNER.

